Overview:Backtracks is a boxed set by Australian hard rock band AC/DC. It was announced on 29 September 2009 and was released on 10 November 2009. This is a collection of the band's studio and live rarities together in one box-set. All tracks have been remastered to match the sound of the 2003 album remasters and many songs appear on CD for the first time. It is the band's second box set of rarities, following the Bonfire release in 1997.